You can use both free and premium version of Yousician with your students.
The free version is a great way to try Yousician, to see how it works for you and your students. The practice time is limited, but they receive feedback on accuracy and timing, earn stars etc.
The advantage of the premium version is that practice time is unlimited. Students who pay for Yousician can practice as much as they like. They can spend the time they need to improve, work on their skills, and build mastery. As you know, learning an instrument requires countless hours of effort and attention. Yousician premium helps make the journey engaging, motivating and rewarding.